US6494240B1 - Apparatus for controlled curved sawing or cutting of two-faced cants - Google Patents
Apparatus for controlled curved sawing or cutting of two-faced cants Download PDFInfo
- Publication number
- US6494240B1 US6494240B1 US08/923,176 US92317697A US6494240B1 US 6494240 B1 US6494240 B1 US 6494240B1 US 92317697 A US92317697 A US 92317697A US 6494240 B1 US6494240 B1 US 6494240B1
- Authority
- US
- United States
- Prior art keywords
- cant
- sawing
- clamping
- guiding
- guiding units
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
- B27B31/06—Adjusting equipment, e.g. using optical projection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
- B27B1/007—Methods for subdividing trunks or logs essentially involving sawing taking into account geometric properties of the trunks or logs to be sawn, e.g. curvature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
- B27B25/02—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed and pressure rollers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
- Y10T83/148—Including means to correct the sensed operation
- Y10T83/155—Optimizing product from unique workpiece
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/162—With control means responsive to replaceable or selectable information program
- Y10T83/173—Arithmetically determined program
- Y10T83/175—With condition sensor
- Y10T83/178—Responsive to work
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/525—Operation controlled by detector means responsive to work
- Y10T83/531—With plural work-sensing means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/525—Operation controlled by detector means responsive to work
- Y10T83/536—Movement of work controlled
Definitions
- the present invention relates to an apparatus for causing a controlled curved sawing or cutting of two-faced cants.
- a two-faced cant is produced by removing from a log, either by sawing or chipping, an approximately equal volume from each side, after such log has been rotated in an angular position which places its natural curvature in a plane parallel to the two faces to be obtained in the process. Such cants are subsequently resawn perpendicularly to the cut faces to produce lumber of such dimensions as required in the marketplace.
- the guiding action caused by the angular misalignment of feed rolls as described above is dependent on friction factors which vary with the condition of the wood; in any situation, the actual deviation rate of the workpiece tends to be slow in relation to the total process cycling time of one to two seconds, depending on piece length and feed rate. This condition limits to a large extent reversed curve sawing in compound curvature cants.
- Another object is to provide a control system for the perpendicular resawing or facing of two-faced cants through a guiding procedure which is entirely carried out by contact of mechanical components with the planar faces of the cant and therefore unaffected by any natural surface irregularities encountered on its rough sides.
- a further object of the invention is to provide a curved sawing control system which is not influenced by any type of natural defects in a two-faced cant, thus eliminating the need for previous inspection and reject, while preventing undue saw stresses caused by sudden lateral feed line deviations which may occur in other systems using rough side contact for cant guidance.
- Another object of the invention is to provide a system which can, for any condition of the cant, limit the degree of curving of the cut to whatever is deemed acceptable in sawn lumber with respect to subsequent handling and processing.
- Another object is to provide a mechanical guide system for curved perpendicular resawing of two-faced cants which is mainly free of lateral slippage at the contact areas with the planar faces of the workpiece.
- Another object is to provide a guiding system having definite lateral motion in either direction, such movements being controlled in speed and instantly reversible, thus allowing variable and compound curvatures of a cant to be reproduced in the cut, throughout the full length of the piece.
- a further object is to provide a guiding system which causes a horizontally pivoting motion of the cant, about a vertical rotation axis whose preferred location, in or near the cut zone, can be selected by suitable design of control linkage components of the system.
- one main object of this invention which is to optimize lumber yield when resawing bowed cants, further requires that any movement of the guiding elements be computer programmed from a full form scan of the workpiece as it enters the system.
- the present invention is concerned with a fast positively acting guiding system to be used in processing two-faced cants along the mean axis of their natural curvature, either in multiple resawing perpendicularly to the parallel planar faces, or in squaring off by means of a double facing canter.
- This is achieved by using laterally moveable infeed and ouffeed guiding units joined by a mechanical linkage and working with a longitudinally sawing or cutting unit which may be composed of saws or knife type cutterheads.
- This arrangement is to cause the workpiece (i.e. the two-faced cant) to follow, during its forward travel, a trajectory which will cause a suitable curving cut to be performed by the sawing or cutting unit.
- This result is accomplished by displacement, transversal to the feed axis, of preferably two moveable guiding units consisting of powered rollers clamping unto the horizontally parallel planar faces of the cant, in areas before and beyond the sawing or cutting unit, and continuously moving the cant laterally in opposite directions within those areas during its forward travel through the cut.
- These combined lateral motions are controlled in speed and direction by a computer interpretation of scanner data and they are further positionally interlocked by means of a control linkage connecting the two guiding units.
- the linkage effect beyond insuring total motion synchronism, also establishes a fixed pivotal point for the workpiece, the location of which is determined by the geometry of the linkage itself. This latter feature of the system permits locating this pivotal point by design in the most favorable area to minimize lateral stresses to the cutting elements.
- This preferred area lies between the cutting zone and the rotating axis of the saws or cutter heads so as to limit, on the one hand, lateral stresses on the cutting elements and, at the same time, keep any back rubbing of saw teeth or cutting knives at a practical minimum. It therefore becomes a matter of choice, within the scope of this invention, to locate the pivotal point for the workpiece somewhere between the cutting zone of the saw and its rotating axis, in order to reduce side thrust in said cutting zone and to strive at the same time towards equalizing side pressure on saw teeth in front and back. Both aims are worthwhile and can be reached with the present system, by adjustment of the workpiece pivotal point, through suitable proportioning of the linkage joining the two guiding units, as will be further explained in a detailed description of the diagram showing the general mechanical arrangements.
- curved sawing or cutting may be generated by three different methods of applications: by locating one guiding unit either before the cut or after the cut, or by using guiding units in both areas with a control linkage between the two.
- the main difference in results between these three options can be stated as follows: for a front location of the guiding unit, the latter part of the cut falls beyond its control and necessarily follows a straight line; for a rear location, the opposite occurs in that the first part of the cut is not affected by the guiding system and, therefore, is straight.
- FIG. 1 is a schematic top plan view of a sawing unit embodying the present invention
- FIG. 2 is a schematic side elevational view thereof
- FIGS. 3 a and 3 b show two preferred tangential saw alignments
- FIGS. 4 a , 4 b , 4 c , 4 d and 4 e show five steps of a curved sawing sequence
- FIG. 5 is a schematic diagram of a function and sequence control system
- FIG. 6 is a schematic top plan view of a cutting unit embodying the present invention.
- FIG. 7 is a schematic top plan view of a sawing unit embodying an alternate form of the invention.
- FIG. 8 is a schematic diagram of a function and sequence control system relating to the alternate form of the invention shown in FIG. 7 .
- mechanical components such as motorized rollers having contact solely with the planar faces 100 , 102 of a two-faced cant 104 in order to guide it through either final resawing (FIGS. 1-4) or a squaring off process (FIG. 6 ), whether in a straight line or along the natural curvature of the piece, as determined by previous dimension and form readings by a scanner 106 (see FIG. 5 ).
- a cant resawing embodiment of the present invention is illustrated.
- the embodiment comprises a processing unit 108 disposed between a pair of cant guiding units 110 and 112 , respectively located upstream and downstream of unit 108 .
- the latter comprises a pair of stationary lower rollers 114 and 116 and an upper roller 118 which may swing up or down about axis 120 by the action of a cylinder 122 .
- the unit 108 also comprises a series of vertically disposed and horizontally spaced circular sawing blades 124 rotatable in the direction indicated by arrow 126 by means of a drive unit 127 .
- the first guiding unit 110 comprises a pair of supporting lower rollers 128 and 130 and an upper roller 132 which swings about an axis 134 under the action of a cylinder 136 .
- the second guiding unit 112 comprises a pair of supporting lower rollers 138 and 140 and an upper roller 142 which swings about an axis 144 under the action of a cylinder 146 .
- the first guiding unit 110 is laterally moveable along a pair of sideways 148 , 150 under the action of a connecting lever 152 having one end 154 pivotally mounted to the unit frame 110 and the opposite end 156 pivotally connected to an equalizing lever 158 .
- the second guiding unit 112 is laterally displaceable along a pair of slideways 160 , 162 under the action of a connecting lever 164 having one end 166 pivotally mounted to the unit frame 112 and the opposite end 168 pivotally connected to the equalizing lever 158 .
- the equalizing lever 158 has a fixed pivot point 170 mounted on a firm base, such as the frame of unit 108 .
- a controlling cylinder 172 has its opposite ends 174 , 176 pivotally connected to the frame of unit 108 and the equalizing lever 158 , respectively.
- a cant 104 moves towards the sawing unit 108 , in the direction of arrow 178 , it first passes through the first guiding unit 110 where it is clamped upon its two horizontal faces 100 , 102 through the action of the cylinder 136 , between laterally moveable rollers 128 , 130 and 132 .
- the cant then reaches stationary mounted rollers 114 , 116 and 118 which will also close upon the horizontal faces 100 , 102 and serve as a temporary pivotal point for the cant as guiding unit 110 begins to move laterally on slideways 148 , 150 to initiate the curving cut.
- the forward end of the cant reaches the second guiding unit 112 where rollers 138 , 140 and 142 also close upon the horizontal faces 100 , 102 while unit 112 is moving laterally on slideways 160 , 162 in the opposite direction to that of guiding unit 110 , and in synchronism with it due to the action of an equalizing lever 158 which pivots about axis 170 and joins the two units through connecting levers 152 and 164 .
- an equalizing lever 158 which pivots about axis 170 and joins the two units through connecting levers 152 and 164 .
- Stationary hold-down roll 118 is lifted from the top face of the cant by the action of cylinder 122 .
- the synchronized opposite motions of guiding units 110 and 112 being controlled by cylinder 172 through equalizing lever 158 , cause the horizontally pivoting movement of the cant to continue, at this time around a vertical axis geometrically positioned in the preferred area, by the design location of pivot point 170 on equalizing lever 158 .
- press roll 132 lifts to admit the next incoming cant while stationary clamping roll 118 closes upon the top face 100 of the outgoing cant in order to maintain a pivotal point for it until the curved sawing is completed by the sideways motion of the rear guiding unit 112 .
- press roll 142 also lifts off and both guiding units 110 and 112 return to their base position. Needless to say that, in order to perform straight line sawing, it is only necessary to leave the two guiding units 110 and 112 in a stationary position.
- the basic functional control system as illustrated in FIG. 5 comprises the dimension and form scanner 106 , a rotary encoder 180 , a data processing unit 182 , a computer 184 , and a programable controller 186 which emits signals to a servo valve 188 and to solenoid actuated pneumatic valves 190 and 192 .
- control elements are so programmed as to produce the correct sequential displacements of a positioning infeed device (linear optimizer) 179 , guiding units 110 and 112 , as well as required pressure application and release by rollers 132 , 118 and 142 through their respective cylinders 136 , 122 and 146 .
- the control system functions according to a programmed sequence determined by the longitudinal position of the cant as monitored continuously since scanning, by the pulsation count of the rotary encoder 180 .
- the above described functions of the guiding system are performed in relation to the position of the cant following its initial detection by the scanner of the leading and trailing ends of each cant, which triggers a count by the computer of the electrical impulses generated by the encoder. Since the encoder rotation is mechanically linked to that of the clamping rolls in guiding unit 110 , the amount of impulses emitted and counted is a direct measure of the distance travelled by the cant from the point of detection.
- the synchronizing linkage between guiding units 110 and 112 is moved at controlled speeds by positioning cylinder 172 which, in turn, responds to computer commands through the servo-valve 188 in accordance with scanner data.
- the actual positioning of the guiding units is accomplished by the two connecting arms 152 and 164 which complete the control system. From the foregoing description of the process and the accompanying illustrations, it is easily inferred that the element which determines the curve radius of the cut is the speed of displacement of the guiding units 110 and 112 while the direction of such curve is determined by the direction of motion of these units.
- the synchronizing action of the proposed mechanical linkage 158 , 152 and 164 between guiding units 110 and 112 could be performed by various other means such as causing a constant volume of fluid to be displaced within a closed loop system connected by cylinders to the guiding units or, instead, establishing a computer linkage between two actuating systems, as illustrated in FIGS. 7 and 8 each comprising a servo-valve 188 a , 188 b and cylinder 172 a , 172 b (identical to servo-valve 188 and positioning cylinder 172 in FIG. 5) and each being connected to one of the guiding units.
- the remaining components illustrated in FIGS. 7 and 8 are identical to those illustrated in FIGS. 1 and 5.
- FIGS. 4 a to 4 e show the various phases of the cutting sequence for cant 104 passing through the system, along with other pieces in front and behind it.
- the symbol identification is as follows:
- Transversal arrows indicate lateral movements of units 110 and 112 .
- Black arrows 192 indicate that press rolls 132 - 142 are in contact with cant.
- White arrows 194 indicate that press rolls 132 - 142 are not in contact with cant.
- Black dot 196 indicates contact with cant (FIGS. 4 a , 4 b , 4 d , 4 e ). No black dot indicates no contact with cant (FIG. 4 c ).
- Black dot 196 in FIGS. 4 a , 4 b , 4 d , 4 e also indicates location of pivotal point for cant.
- X mark in FIG. 4 c indicates location of pivotal point for cant.
- Cant 104 is shown going through right-hand curved sawing, following another piece being cut along a curve in the opposite direction.
- a study of the above symbol explanation in relation to FIGS. 4 a to 4 e will confirm that the system described permits processing cants having alternatively right and left hand curvature, while maintaining the minimum longitudinal gap required for the dimensional and form scanning process.
- FIG. 6 An alternative application of this invention in the processing of a two-faced curved cant relates to the squaring off with cutterheads 200 and 202 , such as found in a chipper-canter unit 204 , for subsequent resawing to lumber dimensions.
- This process is illustrated in FIG. 6, where the construction of the guiding units 110 ′ and 112 ′ is identical to that of units 110 and 112 in FIGS. 1 and 2.
- a detailed description of the components of each guiding unit will not be given, a prime mark having been used for their comparative identification.
- the basic difference between resawing and squaring with cutter heads resides in the working characteristics of saws comparatively to knife action.
- the curve is initiated as the cant enters the cut longitudinally with a controlled lateral motion, inasmuch as the trailing end of it is held along a straight line by the feeding apparatus 179 in FIG. 5, until contact of the cant with fixed lateral guides 230 and 232 .
- the curve then continues throughout the cut, with lateral guides 230 and 232 now serving as pivotal point for the cant.
- guiding units 110 ′ and 112 ′ hold the cant 104 consecutively (or jointly) while moving laterally at controlled speeds and in opposite directions, as in the case of the curve sawing system illustrated in FIGS. 1 and 2.
- This lateral control is supplied by an equalizing linkage similar to the one already described, and as illustrated schematically in FIG. 6 .
- Scanner data is computer processed and used in the same manner to generate signals controlling speed and direction of movement of cylinder 172 ′ and therefore of guiding units 110 ′ and 112 ′.
- a further embodiment of this invention would consist in utilizing, either for the curve sawing or the squaring off process, only one of the two guiding units, whether in front of or behind the cutting unit.
- the general effect on curve generation in the cut would be somewhat similar to that of the double synchronized system already described, with two important differences: in no case could the curve be performed throughout the whole length of the cut, since one or the other extremity of the cant (depending on which unit was used) would be cut while outside the guiding area; also, the fixed pivoting point provided for the cant by press roll 118 is not located for the most favorable saw orientation in the cut (see FIGS. 3 a and 3 b ) for which cant pivoting should occur near point marked X in FIG. 4 c , as determined by planned positioning of pivot 170 in the equalizing lever 158 . It can therefore be said that in one way or another the advantages of the double synchronized guiding units would be partially lost for the whole length of a curving cut.
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- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
Description
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/923,176 US6494240B1 (en) | 1997-09-04 | 1997-09-04 | Apparatus for controlled curved sawing or cutting of two-faced cants |
US10/272,349 US6860302B2 (en) | 1997-09-04 | 2002-10-16 | Apparatus for controlled curved sawing or cutting of two-faced cants |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/923,176 US6494240B1 (en) | 1997-09-04 | 1997-09-04 | Apparatus for controlled curved sawing or cutting of two-faced cants |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/272,349 Division US6860302B2 (en) | 1997-09-04 | 2002-10-16 | Apparatus for controlled curved sawing or cutting of two-faced cants |
Publications (1)
Publication Number | Publication Date |
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US6494240B1 true US6494240B1 (en) | 2002-12-17 |
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ID=25448245
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US08/923,176 Expired - Lifetime US6494240B1 (en) | 1997-09-04 | 1997-09-04 | Apparatus for controlled curved sawing or cutting of two-faced cants |
US10/272,349 Expired - Lifetime US6860302B2 (en) | 1997-09-04 | 2002-10-16 | Apparatus for controlled curved sawing or cutting of two-faced cants |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US10/272,349 Expired - Lifetime US6860302B2 (en) | 1997-09-04 | 2002-10-16 | Apparatus for controlled curved sawing or cutting of two-faced cants |
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US (2) | US6494240B1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030034090A1 (en) * | 1997-09-04 | 2003-02-20 | Maurice Brisson | Apparatus for controlled curved sawing or cutting of two-faced cants |
US20040185758A1 (en) * | 2003-03-21 | 2004-09-23 | Omax Corporation | Apparatus that holds and tilts a tool |
US20060144675A1 (en) * | 2005-01-06 | 2006-07-06 | Mitchell Rory M | Conveyor system |
US7308921B1 (en) | 2002-02-28 | 2007-12-18 | Brewer Sr Clarence R | Horizontal curve sawing apparatus |
US20080023105A1 (en) * | 2006-07-26 | 2008-01-31 | Brian Stroud | Canter chipping heads having drive line slip joints |
US20210187779A1 (en) * | 2019-12-20 | 2021-06-24 | Real Performance Machinery, LLC | Workpiece cutting equipment hanging over the top of workpieces |
US11554461B1 (en) | 2018-02-13 | 2023-01-17 | Omax Corporation | Articulating apparatus of a waterjet system and related technology |
US12051316B2 (en) | 2019-12-18 | 2024-07-30 | Hypertherm, Inc. | Liquid jet cutting head sensor systems and methods |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2434434A1 (en) * | 2003-06-26 | 2004-12-26 | Come Bureau | Curved sawing system following the natural curvature of a tray |
US20060219071A1 (en) * | 2005-04-01 | 2006-10-05 | Coe Newnes/Mcgehee Ulc | Method of optimizing processing of successive workpieces through cutting machines |
US20090173411A1 (en) * | 2005-11-09 | 2009-07-09 | Trost Juergen F | Flitch planer |
US8141603B2 (en) * | 2008-02-05 | 2012-03-27 | Patrick M Conry | Variable guide for a gang saw |
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US6494240B1 (en) * | 1997-09-04 | 2002-12-17 | Denis Comact Inc. | Apparatus for controlled curved sawing or cutting of two-faced cants |
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6860302B2 (en) * | 1997-09-04 | 2005-03-01 | Denis Comact Inc. | Apparatus for controlled curved sawing or cutting of two-faced cants |
US20030034090A1 (en) * | 1997-09-04 | 2003-02-20 | Maurice Brisson | Apparatus for controlled curved sawing or cutting of two-faced cants |
US7308921B1 (en) | 2002-02-28 | 2007-12-18 | Brewer Sr Clarence R | Horizontal curve sawing apparatus |
US20040185758A1 (en) * | 2003-03-21 | 2004-09-23 | Omax Corporation | Apparatus that holds and tilts a tool |
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US20080023105A1 (en) * | 2006-07-26 | 2008-01-31 | Brian Stroud | Canter chipping heads having drive line slip joints |
US11554461B1 (en) | 2018-02-13 | 2023-01-17 | Omax Corporation | Articulating apparatus of a waterjet system and related technology |
US12051316B2 (en) | 2019-12-18 | 2024-07-30 | Hypertherm, Inc. | Liquid jet cutting head sensor systems and methods |
US20210187779A1 (en) * | 2019-12-20 | 2021-06-24 | Real Performance Machinery, LLC | Workpiece cutting equipment hanging over the top of workpieces |
Also Published As
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US6860302B2 (en) | 2005-03-01 |
US20030034090A1 (en) | 2003-02-20 |
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